Mousavi and his supporters have defied authorities and held several massive marches to protest against presidential poll results in Tehran following the announcement of President Mahmoud Ahmadinejad’s re-election.

On Wednesday he wrote an open letter to the council, demanding that vigilantes and unidentified plainclothes agents among the police be stopped from attacking demonstrators and destroying private property and cars.

Supreme leader Ayatollah Ali Khamenei on Friday demanded an end to street protests, warning that the opposition leaders would be held accountable for any "bloodshed and violence."